voxl-tflite-server forward compatibility ?

[Philemon Benner]

@Matt-Turi Ok yeah i see. I don't even know why i went to qrb emulator but when building the libuvc library from source in qrb emulator, it still worked for me. I have a running version of it on the Voxl, should that even be possible if it's just made for qrb5165 devices?

[A Former User]

Ah I see. libuvc is a c library, so the code is backwards compatible with gcc-4.9 and can be compiled with the newer gcc. The libs you are trying to compile are c++, so they are affected by the differences between compiler versions.

[Philemon Benner]

@Matt-Turi Ok good to know.

[Philemon Benner]

@Matt-Turi btw why is voxl-emulator architecture armv7l if we have aarch64 on actual voxl? Will this be a problem when compiling in emulator?

[A Former User]

This post is deleted!

[Eric Katzfey]

@Philemon-Benner Voxl is 64 bit and the OS is 64 bit. However, Qualcomm provides many of their packages for the device as 32 bit and, consequently, anything that has a dependency on these packages must also be 32 bit. That is why you can build 64 bit applications and have them run successfully on Voxl. It just means that that application had no 32 bit dependencies.

[Philemon Benner]

Okey thanks for explaining

[Philemon Benner]

@Matt-Turi
I know it's not really related to the voxl but if include directorys in cmake like that:

include_directories(/home/root/third_party/AWS/wrkspace/lib)

the compiler should find the packages located in there or?

[100%] Linking CXX executable Process
/usr/lib/gcc-cross/aarch64-linux-gnu/7/../../../../aarch64-linux-gnu/bin/ld: cannot find -lDiscovery-cpp
/usr/lib/gcc-cross/aarch64-linux-gnu/7/../../../../aarch64-linux-gnu/bin/ld: cannot find -lEventstreamRpc-cpp

but the linked library is located there:

voxl-cross:~(master)$ ls /home/root/third_party/AWS/wrkspace/lib | grep Discovery-cpp
Discovery-cpp
libDiscovery-cpp.a

[Chad Sweet]

Not totally sure what you're asking, but try looking into target_link_libraries in the cmake documentation

[Philemon Benner]

@Matt-Turi Ok so i got it working with CXX17, it's working in voxl-emulator:

voxl-emulator:~$ file program
voxl-mission-logic: ELF 64-bit LSB executable, ARM aarch64, version 1 (GNU/Linux), statically linked, BuildID[sha1]=somekey , for GNU/Linux 5.4.0, not stripped
voxl-emulator:~$ ./program --arg someArg
[2022-03-22 12:23:14.804] [info] someText
[2022-03-22 12:23:14.807] [info] someText
[2022-03-22 12:23:15.279] [info] someText

But on actual voxl it's not working:

voxl:/data$ ./program --arg someArg
FATAL: kernel too old
Aborted

Kernel Versions in voxl-emulator and voxl_platform_3-3-0-0.5.0-a system image are actually different:
emulator kernel version: 5.13.0-35-generic
voxl kernel version: 3.18.71-perf
Shouldn't voxl emulator have the same kernel version as the voxl?
in the docs it says:

• voxl-emulator simulates the VOXL system image and is built alongside the base system image

[Philemon Benner]

Upgrading to newest system image didn't work either

[Eric Katzfey]

@Philemon-Benner voxl-emulator is a Docker image, not a complete Virtual Machine, so it uses the same kernel as the machine you run it on.

[Philemon Benner]

@Eric-Katzfey Ok thanks for the fast answer.